WO2016170757A1 - Appareil de production et procédé de production de bande d'acier plaquée de métal en fusion - Google Patents

Appareil de production et procédé de production de bande d'acier plaquée de métal en fusion Download PDF

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Publication number
WO2016170757A1
WO2016170757A1 PCT/JP2016/002007 JP2016002007W WO2016170757A1 WO 2016170757 A1 WO2016170757 A1 WO 2016170757A1 JP 2016002007 W JP2016002007 W JP 2016002007W WO 2016170757 A1 WO2016170757 A1 WO 2016170757A1
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WIPO (PCT)
Prior art keywords
steel strip
gas
temperature
molten metal
baffle plate
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PCT/JP2016/002007
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English (en)
Japanese (ja)
Inventor
優 寺崎
高橋　秀行
三宅　勝
琢実 小山
悠祐 安福
淳史 稲葉
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Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to EP16782783.1A priority Critical patent/EP3287541B1/fr
Priority to MX2017013462A priority patent/MX2017013462A/es
Priority to CN201680022555.3A priority patent/CN107532271B/zh
Priority to AU2016252193A priority patent/AU2016252193B2/en
Publication of WO2016170757A1 publication Critical patent/WO2016170757A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/51—Computer-controlled implementation
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing

Definitions

  • the present invention relates to a manufacturing apparatus and a manufacturing method for a hot-dip metal-plated steel strip, and more particularly to gas wiping for adjusting a plating adhesion amount on the surface of the steel strip.
  • the steel strip P annealed in a continuous annealing furnace in a reducing atmosphere passes through the snout 10 and continuously into the molten metal bath 14 in the plating tank 12. To be introduced. Thereafter, the steel strip P is pulled up above the molten metal bath 14 via the sink roll 16 and the support roll 18 in the molten metal bath 14, adjusted to a predetermined plating thickness by the gas wiping nozzles 20A and 20B, and then cooled. Then, it is led to the subsequent process.
  • the gas wiping nozzles 20 ⁇ / b> A and 20 ⁇ / b> B are disposed above the plating tank 12 so as to face each other with the steel strip P interposed therebetween, and spray gas toward both surfaces of the steel strip P from the injection port. By this gas wiping, excess molten metal is scraped off, the amount of plating adhesion on the steel strip surface is adjusted, and the molten metal adhering to the steel strip surface is made uniform in the plate width direction and the plate longitudinal direction.
  • the gas wiping nozzles 20 ⁇ / b> A and 20 ⁇ / b> B are usually configured to be longer than the steel strip width in order to correspond to various steel strip widths and to the positional deviation in the width direction when the steel strip is pulled up. It extends to the outside from the part.
  • the turbulence of the gas jet colliding with the steel strip causes a splash of molten metal that falls and scatters below the steel strip, which adheres to the surface of the steel strip, and the surface quality of the plated steel strip.
  • gas pressure the pressure of gas blown from the gas wiping nozzle to the steel strip surface
  • the splashed splash falls into the plating tank and becomes a top dross, which causes a problem that the surface quality of the plated steel strip is deteriorated and the operator needs to remove the top dross.
  • the steel strip passing speed (line speed) may be increased.
  • the line speed when adjusting the coating amount by gas wiping method in the continuous hot dipping process, if the line speed is increased, the initial adhesion amount immediately after passing through the plating bath of the steel strip increases due to the viscosity of the molten metal. For this reason, in order to adjust the plating adhesion amount within a certain range, it is necessary to set the gas pressure to a higher pressure, which greatly increases the splash.
  • Patent Document 1 gas wiping including a main nozzle and a pair of sub nozzles provided above and below the gas nozzle is used, and the temperature of the gas injected from the sub nozzle is 500 ° C. or less and is injected from the main nozzle.
  • a method for producing a hot-dip metal-plated steel strip that is 50 ° C. or more higher than the gas temperature is described.
  • Patent Document 2 describes a method for controlling the amount of adhesion of hot dip plating in which a gas containing combustion gas generated by combustion inside a wiping nozzle is blown at a gas temperature of 300 ° C. or more at the outlet of the gas wiping nozzle.
  • the amount of gas temperature decrease depends not only on the distance between the nozzle and the steel strip but also on conditions such as gas pressure and nozzle angle, and these operating conditions may change from product to product. Therefore, even if the gas temperature Ty at the nozzle outlet is set to a predetermined temperature, the gas temperature at the stagnation point differs depending on the operating conditions, and as a result, the splash generation amount and the top dross generation amount also differ. Even if the gas temperature Ty at the nozzle outlet is set to a predetermined temperature, it is very difficult to accurately predict the gas temperature T at the stagnation point.
  • the present invention suppresses the occurrence of plating surface defects due to splash and top dross even when the operating conditions are variously changed, and stably manufactures a high-quality molten metal plated steel strip. It aims at providing the manufacturing apparatus and manufacturing method of the hot-dip metal plating steel strip which can do.
  • the gas temperature T at the stagnation point is accurately predicted and this is suitable.
  • the present inventors considered that it is necessary to control within a predetermined temperature range. Therefore, the idea was to arrange a baffle plate on the steel strip extension surface in the vicinity of the widthwise end of the steel strip, and to arrange a temperature sensor thereon. Since the temperature T ′ measured by the temperature sensor on the baffle plate is substantially equal to the gas temperature T at the stagnation point, the gas temperature T at the stagnation point can be accurately predicted in-situ.
  • the temperature of the gas to be injected (that is, the gas temperature measured immediately after leaving the gas heating device) is feedback-controlled, and the gas temperature T at the stagnation point (strictly, the temperature It has been found that the above problem can be solved by managing the temperature T ′) measured by the sensor within a suitable predetermined temperature range.
  • a wiping nozzle A supply mechanism for supplying the gas to the gas wiping nozzle; A gas temperature adjusting mechanism capable of changing the temperature of the gas supplied from the supply mechanism to the gas wiping nozzle; A baffle plate that is disposed on the steel strip extension surface in the vicinity of the widthwise end of the steel strip, and avoids collision between gases injected from the pair of gas wiping nozzles, A temperature sensor provided on at least one side of the baffle plate; And a control unit that controls the gas temperature adjusting mechanism based on the output of the temperature sensor.
  • the control unit controls the gas temperature adjusting mechanism to change the temperature of the gas supplied to the gas wiping nozzle when the temperature measured by the temperature sensor is out of a predetermined range set in advance. And the manufacturing apparatus of the molten metal plating steel strip as described in said (1) which accommodates the temperature measured with the said temperature sensor in the said predetermined range.
  • baffle plate is made of a material having a thermal conductivity of 1 W ⁇ m ⁇ 1 ⁇ K ⁇ 1 or less.
  • the apparatus and method for manufacturing a molten metal plated steel strip according to the present invention suppresses the occurrence of plating surface defects due to splash and top dross even when the operating conditions are variously changed. It can be manufactured stably.
  • FIG. 2 is an enlarged view of a tip portion of a gas wiping nozzle 20A and a baffle plate 26 in the manufacturing apparatus 100 shown in FIG.
  • FIG. 2 is an enlarged view of a tip portion of a gas wiping nozzle 20A and a baffle plate 26 in the manufacturing apparatus 100 shown in FIG.
  • FIG. 2 is an enlarged view of a tip portion of a gas wiping nozzle 20A and a baffle plate 26 in the manufacturing apparatus 100 shown in FIG.
  • FIG. 2 is an enlarged view of a tip portion of a gas wiping nozzle 20A and a baffle plate 26 in the manufacturing apparatus 100 shown in FIG.
  • FIG. 2 is an enlarged view of a tip portion of a gas wiping nozzle 20A and a baffle plate 26 in the manufacturing apparatus 100 shown in FIG.
  • FIG. 2 is an enlarged view of a tip portion of a gas wiping nozzle 20A and a baffle plate 26 in the manufacturing apparatus 100 shown in FIG.
  • FIG. 2 is an enlarged view
  • a manufacturing apparatus 100 (hereinafter also simply referred to as “manufacturing apparatus”) and a manufacturing method of a molten metal plated steel strip according to an embodiment of the present invention will be described.
  • the manufacturing apparatus 100 of this embodiment includes a snout 10, a plating tank 12, a sink roll 16, and a support roll 18.
  • the snout 10 is a member having a rectangular cross section perpendicular to the traveling direction of the steel strip that defines a space through which the steel strip P passes, and its tip is immersed in a molten metal bath 14 formed in the plating tank 12. Yes.
  • the steel strip P annealed in a continuous annealing furnace in a reducing atmosphere passes through the snout 10 and is continuously introduced into the molten metal bath 14 in the plating tank 12.
  • the steel strip P is pulled up above the molten metal bath 14 via the sink roll 16 and the support roll 18 in the molten metal bath 14 and adjusted to a predetermined plating thickness by the pair of gas wiping nozzles 20A and 20B. Then, it is cooled and led to a subsequent process.
  • a pair of gas wiping nozzles 20 ⁇ / b> A and 20 ⁇ / b> B are disposed above the plating tank 12 so as to face each other with the steel strip P interposed therebetween.
  • nozzle 20 ⁇ / b> A blows gas from its outlet (injection port 34) toward steel strip P to adjust the amount of plating attached to the surface of the steel strip.
  • the pair of nozzles 20A and 20B scrapes off excess molten metal, adjusts the amount of plating deposited on both surfaces of the steel strip P, and also in the plate width direction and the plate longitudinal direction. It is made uniform with.
  • the nozzles 20 ⁇ / b> A and 20 ⁇ / b> B are usually configured to be longer than the steel strip width in order to correspond to various steel strip widths and to correspond to positional deviations in the width direction when the steel strip is pulled up. It extends to the outside from the widthwise end of the band.
  • the nozzle 20A has an upper nozzle member 32A and a lower nozzle member 32B, and a gas injection port 34 (nozzle slit) is formed between the tips of the upper and lower nozzle members 32A, 32B. ing.
  • the injection port 34 extends in the plate width direction of the steel strip.
  • the vertical cross-sectional shape of the nozzle 20A is a tapered shape that tapers toward the tip.
  • the thickness of the tip portions of the upper and lower nozzle members 32A and 32B may be about 1 to 3 mm.
  • the opening width (slit interval) of the injection port is not particularly limited, but can be about 0.5 to 2.5 mm.
  • a gas supplied from a gas supply mechanism 22 described later passes through a gas flow path defined by the upper and lower nozzle members 32A and 32B, is injected from the injection port 34, and is blown onto the surface of the steel strip P.
  • the other nozzle 20B has the same configuration.
  • the gas supply mechanism 22 supplies gas to the nozzles 20A and 20B.
  • the gas temperature adjusting mechanism 24 has a function of allowing the temperature of the gas supplied from the supply mechanism 22 to the nozzles 20A and 20B to be changed.
  • the gas supply mechanism 22 includes a pipe through which normal temperature gas passes and a blower that pressurizes the gas to a predetermined pressure
  • the gas temperature adjustment mechanism 24 includes a heat exchanger. In this case, the gas pressurized by the blower is heated to a predetermined temperature by the heat exchanger and supplied to the nozzles 20A and 20B.
  • Gas supply and gas temperature adjustment are not limited to the above examples as long as the gas temperature can be changed without delay.
  • a method of mixing combustion exhaust gas of an annealing furnace and air may be used.
  • air is pressurized to a predetermined pressure with a blower, and then the air and the combustion exhaust gas are mixed to produce a mixed gas, and the mixed gas is supplied to the nozzles 20A and 20B.
  • the gas temperature is adjusted by changing the mixing ratio of the combustion exhaust gas. That is, when raising the gas temperature, the ratio of the combustion exhaust gas is increased.
  • the gas supply mechanism 22 has a pipe through which normal temperature air passes and a blower that pressurizes the air to a predetermined pressure, and the gas temperature adjustment mechanism 24 adjusts the mixing ratio of the combustion exhaust gas and air. It has a mechanism to change.
  • a baffle plate 26 is disposed on the steel strip extension surface in the vicinity of the end portion in the width direction of the steel strip P.
  • the baffle plate 26 is disposed between the pair of nozzles 20A and 20B, and contributes to the reduction of the splash by avoiding collision between the gases injected from the pair of nozzles 20A and 20B.
  • the baffle plate 26 disposed in the vicinity of one end portion in the width direction of the steel strip P is illustrated.
  • the baffle plates are disposed in the vicinity of both end portions in the steel strip width direction. In view of avoiding gas collision, this configuration is preferable.
  • the shape of the baffle plate 26 is not particularly limited, a rectangular shape is preferable as shown in FIG. 2, and two sides of the baffle plate 26 are preferably arranged in parallel with the extending direction of the end portion in the width direction of the steel strip P.
  • the thickness of the baffle plate 26 is appropriately determined from the viewpoint of securing rigidity, such as preventing the baffle plate from vibrating due to gas collision, and can be in the range of 4 to 10 mm, for example.
  • the splash prevention performance is improved by bringing the baffle plate 26 closer to the steel strip P.
  • the shortest distance D1 between the baffle plate 26 and the end portion in the width direction of the steel strip P greatly affects the splash prevention performance, and is preferably set to 1 mm or more and less than 10 mm.
  • D1 is 10 mm or more
  • splashing of the splash starts to be noticeable.
  • D1 is less than 1 mm
  • the baffle plate may come into contact with the steel strip.
  • the baffle plate 26 extends to the outside of the end portions of the nozzles 20A and 20B in the steel strip width direction.
  • temperature sensors 28A and 28B are provided on both surfaces of the baffle plate 26. Also, temperature sensors are provided on both surfaces of the other baffle plate (not shown).
  • the type of the temperature sensor is not particularly limited, and for example, a contact thermometer such as a thermocouple can be used.
  • Each temperature sensor can continuously measure the temperature T ′ of the gas blown to each temperature sensor. Since the measured temperature T ′ is substantially equal to the gas temperature T at the stagnation point, the gas temperature T at the stagnation point can be accurately predicted in-situ. Each temperature sensor outputs information on the continuously measured gas temperature T ′ to the control unit 30.
  • the control unit 30 receives the information of the gas temperature T ′ output from each temperature sensor and controls the gas temperature adjusting mechanism 24. That is, the temperature of the gas to be injected is feedback-controlled based on the measured temperature T ′ so that the gas temperature T at the stagnation point (strictly, the temperature T ′ measured by the temperature sensor) is within a suitable predetermined temperature range.
  • the format of the control unit 30 is not particularly limited, and can be realized by, for example, a central processing unit (CPU) inside the computer.
  • control unit 30 controls the gas temperature adjusting mechanism 24 as follows based on the information of the measured temperature T ′ sent from the temperature sensor, and feedback-controls the temperature of the injected gas. .
  • an average for example, arithmetic average
  • T ′ an average of four measurement temperatures sent from a total of four temperature sensors
  • the gas temperature T at the stagnation point (that is, the measured temperature T ′) within a suitable temperature range.
  • the preferred temperature range is the melting point of the molten metal bath ⁇ 100 ° C.
  • the gas temperature T at the stagnation point (that is, the measurement temperature T ′) is controlled in the melting point range of 420 ° C. ⁇ 100 ° C., that is, in the range of 320 ° C. to 520 ° C.
  • control when the measured temperature T ′ is lower than the median value so that the measured temperature T ′ is always close to a predetermined temperature (for example, the median value) in the preferred temperature range described above,
  • the control is such that the gas temperature is changed high, the gas temperature is not changed when the measured temperature T ′ is the median value, and the gas temperature is changed lower when the measured temperature T ′ is higher than the median value. It is done.
  • the gas temperature is not changed while the measured temperature T ′ is within the above-mentioned preferable temperature range, and the gas temperature is changed only when the temperature is out of the predetermined temperature range.
  • the control to perform is mentioned. Specifically, when the measured temperature T ′ is less than the lower limit value of the preferred temperature range, the gas temperature is changed to be higher, and when the measured temperature T ′ exceeds the upper limit of the preferred temperature range, the gas temperature is lowered. change. In this way, the temperature measured by the temperature sensor is within the above-mentioned preferable temperature range.
  • the interval for performing feedback control is not particularly limited.
  • the gas temperature may be measured intermittently, and information on the measured temperature may be sent to the control unit to intermittently perform feedback control.
  • the former is preferable from the viewpoint of more accurately managing the gas temperature T at the stagnation point.
  • the temperature of the gas supplied to the gas wiping nozzle (that is, the gas temperature measured immediately after leaving the gas heating device) is controlled based on the output of the temperature sensor and continuously from the molten metal bath 14. Gas is blown from a pair of nozzles 20A and 20B to the steel strip P that is pulled up to adjust the plating adhesion amount on both sides of the steel strip P.
  • the gas temperature T at the stagnation point can be accurately predicted, and this can be always maintained and managed within a suitable predetermined temperature range. Therefore, it is possible to suppress the occurrence of plating surface defects due to splash and top dross and to stably produce high-quality molten metal-plated steel strips, even when the operating conditions are variously changed. .
  • the number of temperature sensors may be one, two, or three.
  • one temperature sensor may be provided on one side, or two temperature sensors, one each on each side, may be provided.
  • the average for example, arithmetic average
  • the manufacturing apparatus 100 of the present embodiment sets the height of the baffle plate 26 from the bath surface of the molten metal bath so that the vertical position of the baffle plate 26 can move up and down following the height of the nozzles 20A and 20B. It is preferable to have a movable mechanism that is variable. Thereby, even if the height of the nozzle is changed, the gas temperature can always be measured with the maximum collision pressure of the gas to the steel strip P, so that the temperature of the injected gas can be controlled with high accuracy.
  • the baffle plate 26 is fixed to a frame (not shown) of the wiping nozzle.
  • air pressure can be used.
  • an edge sensor for measuring the distance D1 with the steel strip is attached to the upper part of the baffle plate.
  • the baffle plate 26 is positioned so as to have the target distance D1.
  • a heat insulating material (not shown) between the baffle plate 26 and the temperature sensors 28A and 28B. This is to prevent heat from being transferred from the baffle plate to the temperature sensor and the gas temperature from being accurately measured.
  • the heat insulating material include glass wool and cellulose fiber, but are not particularly limited thereto.
  • the baffle plate 26 is preferably made of a material having a thermal conductivity of 1 W ⁇ m ⁇ 1 ⁇ K ⁇ 1 or less.
  • the material having low thermal conductivity includes ceramics such as alumina and silicon carbide, but is not particularly limited thereto.
  • the distance D2 between the nozzle tip and the steel strip surface is preferably in the range of 3 to 40 mm. If D2 is 3 mm or more, nozzle clogging due to splash is difficult to occur, and if it is 40 mm or less, the gas pressure for realizing the target adhesion amount can be reduced, and as a result, the amount of gas heating can be reduced. Can do.
  • the vertical distance H between the center of nozzle nozzle 34 and the center of temperature sensor 28 is preferably in the range of 0 to 5 mm. If H is 5 mm or less, the temperature T ′ of the gas blown to the temperature sensor can be measured more accurately.
  • Examples of the hot-dip galvanized steel strip manufactured by the manufacturing apparatus and manufacturing method of the present invention include a hot-dip galvanized steel sheet, which is a plated steel sheet (GI) that is not subjected to an alloying treatment after the hot dip galvanizing process. Any of the plated steel sheets (GA) subjected to alloying treatment is included.
  • a hot-dip galvanized steel sheet which is a plated steel sheet (GI) that is not subjected to an alloying treatment after the hot dip galvanizing process.
  • GI plated steel sheet
  • GA plated steel sheets subjected to alloying treatment
  • a steel strip with a thickness of 0.8 mm and a plate width of 1000 mm is passed at various speeds with a line speed of 120 to 180 m / min, and the gas pressure is set to various pressures in the range of 50 to 100 kPa.
  • the line speed, gas pressure, and distance D2 were set so that the plating adhesion amount was constant at about 50 g / m 2 .
  • the gas supply method to the nozzle and the adjustment of the gas temperature employed a method in which normal temperature gas was heated to a predetermined temperature with a heat exchanger and pressurized with a blower to a predetermined pressure.
  • the baffle plate was not provided, the temperature sensor was provided at the nozzle outlet, and the experiment was performed while controlling the nozzle outlet temperature Ty to be within the range of 320 to 520 ° C.
  • baffle plates two baffle plates, one each in the vicinity of the ends on both sides in the steel strip width direction, were arranged.
  • a total of four temperature sensors (sheath K thermocouples), one each on the center of both surfaces, were arranged.
  • the size of the baffle plate was as follows: height (steel strip running direction dimension) 50 mm, width (steel strip width direction dimension) 200 mm, and thickness 5 mm.
  • the distance D1 between the baffle plate and the end of the steel strip in the width direction was 10 mm in Invention Example 1, and 5 mm in Invention Examples 2 to 5. Based on the temperature measured by the temperature sensor, the gas temperature T at the stagnation point was predicted, and the temperature of the injected gas was feedback controlled.
  • the measurement temperature T ′ an arithmetic average of four measurement temperatures sent from a total of four temperature sensors was used as the measurement temperature T ′.
  • the gas temperature is not changed while the measured temperature T 'is within the range of 320 to 520 ° C.
  • the gas temperature is changed to a higher value.
  • temperature T 'exceeded 520 degreeC gas temperature was changed low. This control was performed continuously during operation.
  • the baffle plate was made of SUS304 (thermal conductivity 17 W ⁇ m ⁇ 1 ⁇ K ⁇ 1 ).
  • glass wool was disposed as a heat insulating material between the baffle plate made of SUS304 and the temperature sensor.
  • the baffle plate is made of alumina with low thermal conductivity (thermal conductivity 0.20 W ⁇ m ⁇ 1 ⁇ K ⁇ 1 ), and glass wool is disposed as a heat insulating material between the baffle plate and the temperature sensor. .
  • the baffle plate is made of alumina having low thermal conductivity, glass wool is disposed as a heat insulating material between the baffle plate and the temperature sensor, and the height of the baffle plate from the bath surface is variable.
  • a movable mechanism was adopted.
  • the splash occurrence rate and the top dross generation amount were evaluated.
  • the splash occurrence rate is a ratio of the steel strip length determined to have a splash defect in the inspection process to the steel strip length passed under each manufacturing condition, and includes a slight splash defect that does not cause a practical problem.
  • the amount of top dross generated is the weight obtained by scooping up and weighing the top dross that floated on the bath surface with a handle for 1 hour.
  • the hot dip galvanizing bath temperature at the time of experiment was implemented at 460 degreeC.
  • Figure 5 shows the incidence of splash under each condition.
  • the average of the splash occurrence rate under the 10 operation conditions in the comparative example is set to 100, and the average of the splash occurrence rate under the 10 operation conditions in each invention example is normalized and displayed.
  • the standard deviation of the splash incidence in the comparative example and each invention example is also shown.
  • the top dross generation amount and the standard deviation under each condition are shown in FIG.
  • Invention Example 1 has a reduced splash occurrence rate compared to the comparative example.
  • the standard deviation ⁇ was reduced from 0.26 to 0.088, and the splash rate could be stably reduced under various operating conditions.
  • the amount of generated top dross was reduced in Invention Example 1 than in Comparative Example.
  • Invention Example 2 further reduces the splash occurrence rate, its standard deviation, and the amount of top dross generation compared to Invention Example 1. This is thought to be because the effect of preventing splash was further increased because the distance D1 was shortened compared to the first invention example.
  • Invention Examples 3 and 4 were able to further reduce the amount of splash generated, its standard deviation, and the amount of top dross generated, as compared with Invention Example 1. This is presumably because the temperature T ′ of the gas blown to the temperature sensor could be measured with high accuracy.
  • Invention Example 5 the amount of splash generation, its standard deviation, and the amount of top dross generation could be further reduced than in Invention Examples 3 and 4. This is considered to be because the temperature T ′ of the gas blown to the temperature sensor could be measured with high accuracy by moving the baffle plate up and down in addition to the effect of the heat insulating material.
  • the apparatus and method for manufacturing a molten metal plated steel strip according to the present invention suppresses the occurrence of plating surface defects due to splash and top dross even when the operating conditions are variously changed. It can be manufactured stably.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'invention concerne un appareil de production d'une bande d'acier plaquée de métal en fusion, permettant de produire une bande d'acier plaquée de métal en fusion de haute qualité de façon stable et d'éviter la survenue de défauts sur les surfaces plaquées en raison de projections ou d'écume de surface même lorsque divers changements sont appliqués aux conditions de fonctionnement. Un appareil 100 de production d'une bande d'acier plaquée de métal en fusion selon la présente invention est caractérisé en ce qu'il comprend : une paire de buses 20A, 20B d'essuyage au gaz destinées à ajuster la quantité de dépôts sur les deux surfaces d'une bande d'acier P; un mécanisme 22 d'alimentation en gaz; un mécanisme 24 de réglage de la température du gaz; une plaque formant chicane 26 disposée à proximité d'une section d'extrémité dans le sens de la largeur de la bande d'acier P et située sur un plan s'étendant à partir de la bande d'acier; un capteur de température 28 disposé sur au moins une surface de celui-ci; et une unité de commande 30 qui commande le mécanisme 24 de réglage de la température du gaz sur la base d'une sortie du capteur de température 28.
PCT/JP2016/002007 2015-04-20 2016-04-13 Appareil de production et procédé de production de bande d'acier plaquée de métal en fusion WO2016170757A1 (fr)

Priority Applications (4)

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EP16782783.1A EP3287541B1 (fr) 2015-04-20 2016-04-13 Appareil de production et procédé de production de bande d'acier plaquée de métal en fusion
MX2017013462A MX2017013462A (es) 2015-04-20 2016-04-13 Aparato y metodo para la produccion de banda de acero recubierta con metal por inmersion en caliente.
CN201680022555.3A CN107532271B (zh) 2015-04-20 2016-04-13 热镀金属钢带的制造装置和制造方法
AU2016252193A AU2016252193B2 (en) 2015-04-20 2016-04-13 Apparatus and method for producing hot-dip metal coated steel strip

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JP2015-086079 2015-04-20
JP2015086079A JP6044669B2 (ja) 2015-04-20 2015-04-20 溶融金属めっき鋼帯の製造装置及び製造方法

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JP6697418B2 (ja) * 2017-05-31 2020-05-20 Ｊｆｅスチール株式会社 高温ガスワイピング装置
CN112513313B (zh) * 2018-08-22 2023-03-21 杰富意钢铁株式会社 熔融金属镀覆钢带的制造方法及连续熔融金属镀覆设备
JP6638872B1 (ja) * 2018-08-22 2020-01-29 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯の製造方法及び連続溶融金属めっき設備
CN109777979B (zh) * 2019-02-19 2020-10-30 中南大学 一种调控超宽幅铝合金板材横断面组织均匀性的方法
CN112481573B (zh) * 2020-12-18 2023-02-17 江阴市华达机械科技有限公司 气刀边部挡板总成

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JPH06172955A (ja) * 1992-12-01 1994-06-21 Sumitomo Metal Ind Ltd 溶融めっき金属板のめっき厚制御装置及び制御方法
JP2005256050A (ja) * 2004-03-10 2005-09-22 Nisshin Steel Co Ltd 溶融めっき鋼板の表面外観調整方法および表面外観調整装置

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JPH06116698A (ja) * 1992-10-06 1994-04-26 Sumitomo Metal Ind Ltd 鋼帯の連続溶融金属めっき装置
JPH09195023A (ja) * 1996-01-11 1997-07-29 Sumitomo Metal Ind Ltd ギャップ可変式ガスワイピングノズル装置
JP4862479B2 (ja) * 2006-05-12 2012-01-25 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯の製造方法
JP5549050B2 (ja) * 2007-09-05 2014-07-16 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯の製造装置
JP5493260B2 (ja) * 2007-10-09 2014-05-14 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯製造装置及び溶融金属めっき鋼帯の製造方法
JP5812581B2 (ja) * 2010-07-13 2015-11-17 スチールプランテック株式会社 バッフルプレートユニットおよびそれを用いたガスワイピング装置

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Publication number Priority date Publication date Assignee Title
JPH06172955A (ja) * 1992-12-01 1994-06-21 Sumitomo Metal Ind Ltd 溶融めっき金属板のめっき厚制御装置及び制御方法
JP2005256050A (ja) * 2004-03-10 2005-09-22 Nisshin Steel Co Ltd 溶融めっき鋼板の表面外観調整方法および表面外観調整装置

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CN107532271A (zh) 2018-01-02
AU2016252193B2 (en) 2018-10-18
MX2017013462A (es) 2017-12-07
EP3287541A4 (fr) 2018-04-04
CN107532271B (zh) 2020-09-22
EP3287541A1 (fr) 2018-02-28
JP6044669B2 (ja) 2016-12-14
AU2016252193A1 (en) 2017-10-26
JP2016204694A (ja) 2016-12-08
EP3287541B1 (fr) 2019-07-24

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